do these look like symptoms of a STD?

Relax. Your symptoms dont sound like any STD that I'm aware of. Wearing a condom was one smart decision you made. You can always get tested by a doctor to ease your mind.

Thanks for the feedback. Here are some updates:

I'm now mostly having diarrhea when I go to the bathroom.

My appetite is lost, I'm barely eating - maybe a meal a day

are these symptoms indicative of any STD that can be passed even with the protection used?

I will give you my opinion for what it's worth. I have not had to worry about STD's for a long time because I settled down. But it my wilder days I was very promiscuous and caught an STD 3 times. All was the result of unprotected sex. One of them I still have because theres no cure; herpes.

The only way to truly know is to be tested, but it sounds to me you have an unrelated virus or have worried yourself into being sick.

When the HIV epedimic was first discovered, I just knew I had it due to all the unprotected sex I had. I made myself sick worrying, diarrhea and everything. I had convinced myself that I had it and was very sick. Well, I got up enough nerve to be tested, and it was negative.